The Tour de France begins today with the prologue time trial in Liege. Many people are talking up the chances of Bradley Wiggins becoming the first British tour winner ever but he will face stiff competition from the likes of last year's winner Cadel Evans, Vincenzo Nibali, Sam Sanchez, Frank Schleck and Jurgen Van Den Broeck. After having Alberto Contador looking to have only Andy Schleck as competition just a couple of years ago, the field looks very open and the likelihood is that the podium could be very close. Chris Anker Sorenson, Johnny Hoogerland, Sam Sanchez and Michele Scarponi look to contest the King of the mountains jersey with again no clear favourite. In the points contest, Cavendish will start favourite but will face competition from Peter Sagan. The route this year has many new challenges including the first time climbing of the Col du Grand Colombier before familiar challenges such as the aubisque and Col de Tourmalet. The time trials could also prove vital in the race.